Go back to the main screen and then go down to Advanced BIOS Fetures
From here, go to boot device priority.
Choose 1st Boot Device. Make sure 1st Boot Device is disabled. We don’t want it to boot from the hard drive. Make sure Try Other Boot Devices says Yes
Press ESC to go back one screen and select Hard Disk Drives
From here, change the order that you want the drives to boot up in. We want the 1GB flash drive that we put the installation files on to boot first. Here, mine is USB: Corsair Flash. The picture doesn’t show it, but it needs to be the first one as we will boot off of it the first time in order to install Linux. The second one needs to be USB: Patriot Memory. That will be the drive which will contain the OS. Once we are finished installing Linux, the computer will reboot and will need to be able to look for that drive to boot. The two SATA drives will not be bootable, so let them be 3rd and 4th.
Press ESC back to the main menu and select Save and Exit Setup